Access 123,527 building permits issued in King County, Washington through a single REST API, normalized into a consistent schema. Data through October 22, 2026.
Most common permit types issued in the last year.
Drill into the most common permit categories in King County.
The most active contractors by permit volume in King County, with a profile of each one's permit history. Counts are permits we hold for King County.
Every permit we hold for one King County address (roof, HVAC, solar, additions, with dates and contractors) in a single call to /v1/property/history. Used by lenders for collateral review, insurers for roof and system age, and real estate teams for due diligence.
The 10 most recent permits issued in King County, Washington. Full dataset available via REST API.
| Issued | Permit # | Address | Category | Description |
|---|---|---|---|---|
| 2026-10-22 | ADDC26-0619 | 14255 183RD AVE SE | Renovation | Luis Residence and ADU |
| 2026-10-22 | ADDC26-0618 | 30208 SE 312TH WAY | Renovation | VAKULICH DETACHED GARAGE |
| 2026-10-22 | MECH26-1926 | 12418 232ND WAY NE | Mechanical | 12418 232ND WAY NE, REDMOND, WA 98053 |
| 2026-10-22 | MECH26-1927 | 13101 ADAIR CREEK WAY NE | Mechanical | 13101 ADAIR CREEK WAY NE, REDMOND, WA 98053 |
| 2026-10-22 | MECH26-1929 | 15234 SE 171ST PL | Mechanical | 15234 SE 171ST PL, RENTON, WA 98058 |
| 2026-10-22 | BASC26-0069 | — | New construction | Reserve at Washington National|9 |
| 2026-10-22 | MECH26-1925 | 16105 SE 145TH PL | Mechanical | 16105 SE 145TH PL, RENTON, WA 98059 |
| 2026-10-22 | MECH26-1928 | 13919 212TH DR NE | Mechanical | 13919 212TH DR NE, WOODINVILLE, WA 98077 |
| 2026-10-22 | MECH26-1930 | 10409 SW CEMETERY RD | Mechanical | 10409 SW CEMETERY RD, VASHON, WA 98070 |
| 2026-10-22 | DWEL26-0187 | 17409 NE 136TH ST | New construction | Steel Unit C DADU |
Query King County, Washington permits with a single HTTP request. Returns JSON with address, category, status, dates, and full description.
# Search King County permits issued in the last 30 days curl -H "X-API-Key: YOUR_KEY" \ "https://api.permit-stack.com/v1/permits/search?jurisdiction=King%20County&state=WA&issued_after=2026-09-23"
The official record sets behind this page, with the date each one's data runs through.
| Record set | Source | Permits | Data through | Note |
|---|---|---|---|---|
| Building permits | EnerGov permit portal | 116,548 | 2026-08-09 | Upstream access blocked since 2026-08-18 (66d) — the host refuses our requests (HTTP 403); we cannot confirm whether the source itself has stopped. |
| Building permits | Accela Citizen Access portal | 6,979 | 2026-10-22 |
Related coverage in Washington and nationwide.
We ingest King County's official permit records directly from 2 official record sets, each listed under Sources on this page and normalize them into a consistent JSON schema across our U.S. jurisdictions.
The newest permit we hold for King County, Washington is dated October 22, 2026. We re-read this source on a nightly schedule and publish the date the data runs through rather than the date we last polled. Some cities publish permits days after they are filed.
Yes — search King County permits free in the browser, no signup needed. The API needs a free key (100 requests per day, no credit card).
Yes. CSV export is available on every plan, including free, with the row cap rising by tier. Webhooks (Developer plan and up) push new permits after each nightly ingest.
Most King County permits are issued on the same day they are filed, reflecting electronic submission and same-day processing for routine permit types. Larger or more complex projects (new construction, major additions) often take longer.
Free tier covers 100 requests per day. No credit card required.
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